Users of our lists complained that they did not receive any message from the lists anymore. But on the other hand, other users replied to each other as if everything was fine.
We had forgotten to increase the maxrcpts number in the bofh file. for more info, see the courier faq question : "Messages with more than 20 recipients are rejected" http://www.courier-mta.org/FAQ.html
When the number of recipients exceeds the allowed maximum, the additional recipient addresses are rejected, with a clear error message.
It is a bug if mailman ignores the error, without reporting it.
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